Blower motor resister junk again?????

[tawlman82]

1995 Ford explorer Limited......This is the second time in just over a year this has happened....Blower stays on after truck is off. Last time I replaced the Blower Motor resister and it fixed the problem...of course until winter is almost here again!!!!! Can something be making the resister go bad or did I just get a bad part????? FYI This was the auto climate control. Thanks for all ideas....just don't wanna be in the same situation 9 months from now!!!!!

 

[BrooklynBay]

Was this part a new part, or was it from a junk yard? Did you check it with an Ohm meter? Do you see where the coil(s) might have blown out?

 

[tawlman82]

Hi....the part was not new so probably from junk yard, not sure if it was tested I didn't test it.....as for the coils blown out I haven't even pulled this one out yet.....Just kinda figured its doing the same ting so it prolly is the same problem....thanks for you help

 

[gijoecam]

The resistor won't keep the blower motor running with the key off. That's, more than likely, the relay sticking.

I don't have the schematics for the 95 in front of me. I'll see what I can dig up from work tomorrow.

-Joe

 

[vrytired]

pop the hood and thunk relays one at a time until it shuts off. replace the one that the thunking fixed.

 

[tawlman82]

Hi...no relay..last time same problem replaced resistor problem fixed until now. And actually today I put the fuse back in and have had no problems. Not really sure....I don't mind replacing the resistor again but not if there is another problem causing them to go bad. Thanks for your help.

 

[gijoecam]

Finally had a chance to pull up the schematics. The resistors are the only ground path for the blower motor in any of the low speed positions. On high, the high speed relay switches and grounds the blower directly, bypassing the resistors. Power in comes from the blower motor relay, which is switched. If the blower continues to run with the ignition off, either the ignition is not cutting power to the relay, or the relay is sticking. With the key off, there's no way the motor should have power in the first place.

So, how to check it: Turn the key off. If the blower motor continues to run, pull fuse #6 (7.5A) from the interior fuse panel and check for power at both contacts. (both contacts should be dead with the ignition off, one should have power with the ignition on)

Now, if you pull fuse #6, and the key is off, that should kill the blower. If the blower continues to run, it can only be because the relay has stuck.

Check it out and let us know what you find.

-Joe